I play as Real Madrid; I play on a PS5. When attempted to change my tactics, literally everything doesn't save. When I attempt to change the team's formation, even if I save, when I exit to the play match menu and re-enter the tactics menu, everything resets. When attempting to create a new custom tactic, the new tactic doesn't save. When attempting to edit the default tactic, nothing saves.
Substituting players? Doesn't doesn't save. Changing player roles? Doesn't save. Adjusting formation, build-up style, and defensive approach? None save.
I have been insistent in saving every alteration I make. When switching between the two tactics menus, there is no problem. It's only when I exit to the play match menu to play have I realized the work done is erased.